code: def next(self):
      item = self.it.next()
  
      if item is None:
          return None
  
      keys = item[0]
      value = item[1]
  
      return keys[self.prefix_len :], value
  
imports: from aim.storage.container import Container, ContainerItemsIterator, ContainerKey, ContainerValue
  from aim.storage.containertreeview import ContainerTreeView
  from typing import Iterator, Tuple
label_desc: Use image node_id 2 for calling the PrefixViewItemsIterator obj's underlying member method code with example usage: obj.next() and returns: keys,  value, None